Subject: Re: GNU C with MSDOS/Desqview-X
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Date: Mon, 26 Oct 92 18:57:39 MST
From: arrakis!thor AT uunet DOT UU DOT NET (Robert B. Hood)

Believe it or not, Mike Grapevine said:
> 
> Hello,
> 	I am using the GNU C compiler/linker to develop
> X applications for use with Desqview/X under MSDOS. I can
> create some small applications which compile and link 
> successfully, but I have a problem with any application
> of considerable size (> 200 lines). These latter mentioned
> applications will compile and link successfully, but when I
> try to run them, I get "segmentation violation errors at 
> so and so address" from the MSDOS operating system. I have looked
> through the GNU C documentation for any other switches I
> should use for creating programs to run under MSDOS, but 
> have not found any. This is the makefile I am using:
> 
[...]
> 
> 	Has anybody been able to create and execute 
> "big" X-Windows applications with GNU C to be used
> with Desqview/X and MSDOS. I know that my source code 
> is not the cause because I compiled and ran it on a SPARC 
> successfully. 
> 

I am working on porting SNEWS (the News system for UUPC) to X windows
as XNEWS using DGJPP 1.08 and QDDVX101.ZIP.  I have it pretty well
underway (about 60% complete).

My total source (excluding headers files and including comments) is around
5,000 lines.  I don't think it is the size of your source.

One problem I had (that I *don't* seem to have writting C for MS-DOS)
is that the resulting program is very sensitive to where pointers are
pointing.  If you try to free a NULL pointer, for instance, you will
get the aforementioned segmentation violation.

You might look there.

Bob
-- 
Bob Hood    thor AT arrakis DOT denver DOT co DOT us     H: 303-980-8392  W: 303-632-2180
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